Emerging sprinter chasing Asian Games medal, natl. record in 100m dash

South Korean sprinter Joel Jin Nwamadi has been setting new personal-best times in the men's 100 meters at virtually every meet this season. The 20-year-old said he will try to break it one more time next month at the Asian Games in Japan. Born in Seoul to a Nigerian father and a Korean mother, Nwamadi posted a personal-best 10.23 seconds at an event in Japan in April. Earlier at the same…